CN104993705A - Multistage power amplification and pulse width modulation type mixed protection stabilized switching power supply - Google Patents
Multistage power amplification and pulse width modulation type mixed protection stabilized switching power supply Download PDFInfo
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- CN104993705A CN104993705A CN201510310454.3A CN201510310454A CN104993705A CN 104993705 A CN104993705 A CN 104993705A CN 201510310454 A CN201510310454 A CN 201510310454A CN 104993705 A CN104993705 A CN 104993705A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Dc-Dc Converters (AREA)
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Abstract
The invention discloses a multistage power amplification and pulse width modulation type mixed protection stabilized switching power supply which is mainly composed of a diode rectifier U, a power amplifier P1, a transformer T, a switching filter circuit, a power output circuit, a variable-voltage feedback circuit, a switching control circuit, an oscillator, a current comparator I1, a current comparator I2, a slope compensator W, a PWM controller, a sliding controller, a logic protection amplification circuit, and a mixed protection circuit. The circuit can be disconnected when the running temperature of the circuit is too high or the voltage is too high, so that the circuit structure is better protected, and the running safety of the circuit and the service life of the circuit are improved. As a field effect transistor is used to form the switching control circuit, the stabilized switching power supply of the invention has a step-up mode and a step-down mode, the change in output current in the full voltage range is controlled between -0.1% and +0.1%, and the output current change control range is improved greatly compared with that of a traditional stabilized switching power supply.
Description
Technical field
The present invention relates to a kind of switching power supply, specifically refer to a kind of multiple power levels amp pulse width modulation type hybrid protection type switching power supply.
Background technology
Along with continuous progress scientific and technological at present, electronic product also brings great convenience to people are in life while function from strength to strength.Voltage stabilizing circuit is just runed and gives birth to, and traditional series connection linear regulator type voltage stabilizing circuit has the features such as stability is high, output voltage is adjustable, ripple coefficient is little, circuit is simple.But the Correctional tube of these series connection linear regulator type voltage stabilizing circuits is always operating at magnifying state, and have electric current to flow through, therefore the power consumption of its pipe is comparatively large, the efficiency of circuit is not high, generally can only reach about 30% ~ 50% always.In order to overcome above-mentioned defect, people just have developed switching mode voltage stabilizing circuit.
In switching mode voltage stabilizing circuit, surge pipe is operated on off state, pipe alternation saturated with cut-off two states in.When pipe saturation conduction, though it is large to flow through pipe current, but tube voltage drop is very little; When pipe ends, tube voltage drop is large, but the electric current flow through is close to zero.Therefore, under power output the same terms, the efficiency of switching mode voltage stabilizer coin series regulator is high, generally can reach about 80% ~ 90%.But it is comparatively large that the switching mode voltage stabilizer that current people adopt but exists ripple coefficient, when Correctional tube constantly switches between saturated and cut-off state, radio frequency interference can be produced to circuit, circuit more complicated and cost is higher.
Summary of the invention
The object of the invention is to the defect that ripple coefficient is comparatively large, radio frequency interference is serious, circuit is complicated and efficiency is not high overcoming the existence of current switching mode voltage stabilizer, a kind of multiple power levels amp pulse width modulation type hybrid protection type switching power supply is provided.
Object of the present invention is achieved through the following technical solutions:
A kind of multiple power levels amp pulse width modulation type hybrid protection type switching power supply, primarily of diode rectifier U, power amplifier P1, transformer T, be serially connected in the switched filter circuit between diode rectifier U and power amplifier P1, the power output circuit be connected with the secondary coil L2 of transformer T, the transformation feedback circuit be connected with the secondary coil L3 of transformer T, the ON-OFF control circuit be connected with transformation feedback circuit, the oscillator be connected with ON-OFF control circuit, the current comparator I1 be connected with ON-OFF control circuit, the current comparator I2 be connected with ON-OFF control circuit, respectively with oscillator, the slope equalizer W that current comparator I1 is connected with current comparator I2, the PWM controller be connected with current comparator I1 with power amplifier P1 respectively, and output is connected with the tap on the primary coil L1 of transformer T, and the sliding damper that input is connected with the output of power amplifier P1 forms, virtual protection amplifying circuit is also serially connected with between the cathode output end and the negative input of power amplifier P1 of diode rectifier U, this virtual protection amplifying circuit is primarily of power amplifier P3, power amplifier P4, NAND gate IC1, NAND gate IC2, negative pole is connected with the electrode input end of power amplifier P3, the polar capacitor C7 that positive pole is connected with the negative input of NAND gate IC2 after resistance R7, one end is connected with the negative input of NAND gate IC1, the resistance R4 that the other end is connected with the electrode input end of power amplifier P3, be serially connected in the resistance R5 between the negative input of power amplifier P3 and output, one end is connected with the output of NAND gate IC1, the resistance R6 that the other end is connected with the negative input of power amplifier P4, be serially connected in the polar capacitor C8 between the electrode input end of power amplifier P4 and output, positive pole is connected with the output of NAND gate IC2, negative pole is in turn through electric capacity C9 that voltage stabilizing didoe D4 is connected with the output of power amplifier P3 after resistance R8, P pole is connected with the output of power amplifier P4, N pole is in turn through diode D5 that resistance R10 is connected with the tie point of resistance R8 with voltage stabilizing didoe D4 after resistance R9, and N pole is connected with the negative pole of electric capacity C9, the voltage stabilizing didoe D6 that P pole is connected with the tie point of resistance R10 with diode D5 forms, the electrode input end of described NAND gate IC1 is connected with the negative input of power amplifier P3, the electrode input end of the output NAND gate IC2 of power amplifier P4 is connected, and its electrode input end is then connected with the output of power amplifier P3, described resistance R9 is connected with the cathode output end of diode rectifier U with the tie point of resistance R10, and the positive pole of polar capacitor C7 is then connected with the negative input of power amplifier P1, diode rectifier U is also provided with mixed type protective circuit, described mixed type protective circuit is by incoming line, transformer T101, diode rectifier U101, integrated regulator Q101, time-base integrated circuit Q102, triode VT101, triode VT102, triode VT103, triode VT104, operational amplifier P101, operational amplifier P102, minus earth, the electric capacity C101 that positive pole is connected with the positive output end of diode rectifier U101, minus earth, the electric capacity C102 that positive pole is connected with the OUT pin of integrated regulator Q101, one end is connected with the positive pole of electric capacity C102, the resistance R101 that the other end is connected with the negative input end of operational amplifier P101, N pole is connected with the positive pole of electric capacity C102, the diode D101 that P pole is connected with the collector electrode of triode VT101, the relay K 101 in parallel with diode D101, one end is connected with the collector electrode of triode VT101, the resistance R103 of other end ground connection after resistance R102, one end is connected with the base stage of triode VT101, the resistance R104 that the other end is connected with the output of operational amplifier P101, one end is connected with the N pole of diode D101, the resistance R105 that the other end is connected with the collector electrode of triode VT103, one end ground connection, the slide rheostat TP101 that the other end is connected with the positive input terminal of operational amplifier P101, minus earth, the electric capacity C103 that positive pole is connected with the positive input terminal of operational amplifier P101, minus earth, the electric capacity C104 that positive pole is connected with the OUT pin of integrated regulator Q101 after resistance R109, one end is connected with the OUT pin of integrated regulator Q101, the resistance R108 that the other end is connected with the collector electrode of triode VT102 with the negative input end of operational amplifier P102 simultaneously, one end ground connection, the resistance R107 that the other end is connected with the negative input end of operational amplifier P102, one end is connected with the base stage of triode VT102, the resistance R106 that the other end is connected with the output of operational amplifier P102, P pole is connected with the positive input terminal of operational amplifier P102, the voltage stabilizing didoe D102 that N pole is connected with the positive pole of electric capacity C104, one end is connected with the positive pole of electric capacity C103, the resistance R101 that the other end is connected with the positive pole of electric capacity C101, negative pole is connected with the positive pole of electric capacity C104, the electric capacity C105 that positive pole is connected with the collector electrode of triode VT104, one end is connected with the positive pole of electric capacity C105, the resistance R110 that the other end is connected with the positive pole of electric capacity C101 after relay K 102, N pole is connected with the positive pole of electric capacity C101, the diode D103 that P pole is connected with the base stage of triode VT104 after resistance R111, P pole is connected with the positive pole of electric capacity C101 after resistance R112, the diode D105 that N pole is connected with the Discharge pin of time-base integrated circuit Q102, P pole is connected with the N pole of diode D105, the diode D104 that N pole is connected with the emitter of triode VT104, one end is connected with the P pole of diode D105, the other end is connected with the N pole of diode D104, the slide rheostat RP102 that sliding end is connected with the Control voltage pin of time-base integrated circuit Q102, N pole is connected with the P pole of diode D105, the diode D106 of P pole ground connection, minus earth, the electric capacity C106 that positive pole is connected with Thresshold pin with the Trigger pin of time-base integrated circuit Q102, the thermistor RT101 in parallel with electric capacity C106, and one end is connected with the N pole of diode D106, the slide rheostat RP103 that the other end is connected with the positive pole of electric capacity C106 after resistance R113 forms, wherein, the secondary two ends of transformer T101 are connected with two inputs of diode ballast U101 respectively, the two ends on its former limit are connected on two incoming lines, the negative output terminal ground connection of diode rectifier U101, the GND pin ground connection of integrated regulator Q101, IN pin is connected with the positive pole of electric capacity C101, the normally-closed contact switch S 101 of described relay K 101 is arranged on incoming line, the normally-closed contact switch S 102 of relay K 102 is arranged on incoming line, the emitter of triode VT101 is all connected with the base stage of triode VT103 with the emitter of triode VT102, the grounded emitter of triode VT103, the P pole of diode D103 is connected with the tie point of relay K 102 with resistance R110, and the P pole of diode D103 is also connected with the Discharge pin of time-base integrated circuit Q102, the grounded emitter of triode VT104, the GND pin ground connection of time-base integrated circuit Q102, its Vcc pin and Reset pin are all connected with the N pole of diode D106.
Further, described switched filter circuit is by triode Q, and electric capacity C1, electric capacity C2, resistance R1, resistance R2 and diode D1 form; The base stage of described triode Q forms loop with its collector electrode in turn after resistance R2, diode D1 and resistance R1, and electric capacity C1 and resistance R1 is in parallel, and electric capacity C2 and resistance R2 is in parallel; The collector electrode of triode Q is connected with the cathode output end of diode rectifier U, its grounded emitter; The cathode output end of diode rectifier U is then directly connected with the negative input of power amplifier P1, and resistance R2 is then connected with the electrode input end of power amplifier P1 with the tie point of diode D1; The primary coil L1 of transformer T is then in parallel with diode D1.
The diode D2 that described power output circuit is connected with the Same Name of Ends of secondary coil L2 by P pole, N pole is connected with the non-same polarity of secondary coil L2 after electric capacity C3, and the inductance L 4 that one end is connected with the N pole of diode D2, the other end is connected with the non-same polarity of secondary coil L2 after electric capacity C4 forms.
Described transformation feedback circuit is made up of diode D3 and electric capacity C5; The P pole of described diode D3 is connected with the non-same polarity of secondary coil L3, its N pole is connected with the Same Name of Ends of secondary coil L3 after electric capacity C5, the Same Name of Ends ground connection of described secondary coil L3.
Described ON-OFF control circuit is made up of field effect transistor MOS, power amplifier P2, voltage comparator U1, inductance L 5 and resistance R3; Described inductance L 5 is serially connected between the output of power amplifier P1 and the N pole of diode D3, and the drain electrode of field effect transistor MOS is connected with the N pole of diode D3, its source electrode ground connection, its grid after resistance R3 are then connected with the output of power amplifier P2; The S end of voltage comparator U1 is connected with the output of oscillator, and its R end is connected with the output of current comparator I1, and its Q end is then connected with the negative input of power amplifier P2; The electrode input end of power amplifier P2 is then connected with the drain electrode of field effect transistor MOS; The electrode input end of current comparator I2 is then connected with the two ends of resistance R3 with negative input, and its output is connected with the input of oscillator with the negative input of current comparator I1 respectively after slope equalizer W; The electrode input end of current comparator I1 is then connected with the output of power amplifier P1; An output of PWM controller is connected with the negative input of power amplifier P1 with the negative input of current comparator I1 respectively, its another output ground connection after electric capacity C6.
The present invention comparatively prior art compares, and has the following advantages and beneficial effect:
(1) the present invention make use of the controlling functions of PWM fully, can automatically regulate electric power output voltage value according to duty ratio, guarantees the stable of output valve.
(2) initiative of the present invention slope equalizer and voltage, current comparator are used in a power, not only effectively reduce circuit self and external radio frequency interference, but also greatly simplify circuit structure, cost of manufacture and maintenance cost are had reduction by a relatively large margin.
(3) the present invention utilizes field effect transistor to form ON-OFF control circuit, the present invention is not only made to have possessed boost mode and decompression mode, but also making the change of full voltage range output current control between ± 0.1%, the output current change control range of more traditional switching power supply is greatly improved.
(4) the present invention is provided with mixed type protective circuit, can at circuit operating temperature open circuit during too high or overtension, better protect circuit structure, improve the useful life of fail safe that circuit runs and circuit.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is virtual protection amplification circuit structure schematic diagram of the present invention.
Fig. 3 is the circuit diagram of mixed type protective circuit of the present invention.
Description of reference numerals:
10, mixed type protective circuit; 20, virtual protection amplifying circuit; 30, PWM controller; 40, oscillator; 50, sliding damper.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, diode rectifier U, power amplifier P1, transformer T, switched filter circuit, power output circuit, transformation feedback circuit, ON-OFF control circuit, oscillator 40, current comparator I1, current comparator I2, slope equalizer W, PWM controller 30, sliding damper 50, mixed type protective circuit 10 and virtual protection amplifying circuit 20 have been the present invention includes.Wherein, transformer T is by the primary coil L1 being arranged on its former limit, and the secondary coil L2 and the secondary coil L3 that are arranged on its secondary form.The present invention is provided with a sliding tap on the primary coil L1 of transformer T, this sliding tap is then controlled by sliding damper 50, to guarantee to adjust turn ratio between the primary coil L1 of transformer T and secondary coil L2 and secondary coil L3 according to the duty ratio of PWM controller 30 and the common results of ON-OFF control circuit, thus realize the output of different voltage.
The input of diode rectifier U is used for the civil power of external 220V, between the cathode output end that switched filter circuit is then serially connected in this diode rectifier U and the electrode input end of power amplifier P1.
As shown in Figure 3, described mixed type protective circuit 10 is by incoming line, transformer T101, diode rectifier U101, integrated regulator Q101, time-base integrated circuit Q102, triode VT101, triode VT102, triode VT103, triode VT104, operational amplifier P101, operational amplifier P102, resistance R101, resistance R102, resistance R103, resistance R104, resistance R105, resistance R106, resistance R107, resistance R108, resistance R109, resistance R110, resistance R111, resistance R112, resistance R113, electric capacity C101, electric capacity C102, electric capacity C103, electric capacity C104, electric capacity C105, electric capacity C106, diode D101, voltage stabilizing didoe D102, diode D103, diode D104, diode D105, diode D106, slide rheostat RP101, slide rheostat RP102, slide rheostat RP103, thermistor RT101 forms, during connection, the minus earth of electric capacity C101, positive pole is connected with the positive output end of diode rectifier U101, the minus earth of electric capacity C102, positive pole is connected with the OUT pin of integrated regulator Q101, one end of resistance R101 is connected with the positive pole of electric capacity C102, the other end is connected with the negative input end of operational amplifier P101, the N pole of diode D101 is connected with the positive pole of electric capacity C102, P pole is connected with the collector electrode of triode VT101, relay K 101 is in parallel with diode D101, one end of resistance R103 is connected with the collector electrode of triode VT101, the other end is ground connection after resistance R102, one end of resistance R104 is connected with the base stage of triode VT101, the other end is connected with the output of operational amplifier P101, one end of resistance R105 is connected with the N pole of diode D101, the other end is connected with the collector electrode of triode VT103, one end ground connection of slide rheostat TP101, the other end is connected with the positive input terminal of operational amplifier P101, the minus earth of electric capacity C103, positive pole is connected with the positive input terminal of operational amplifier P101, the minus earth of electric capacity C104, positive pole is connected with the OUT pin of integrated regulator Q101 after resistance R109, one end of resistance R108 is connected with the OUT pin of integrated regulator Q101, the other end is connected with the collector electrode of triode VT102 with the negative input end of operational amplifier P102 simultaneously, one end ground connection of resistance R107, the other end is connected with the negative input end of operational amplifier P102, one end of resistance R106 is connected with the base stage of triode VT102, the other end is connected with the output of operational amplifier P102, the P pole of voltage stabilizing didoe D102 is connected with the positive input terminal of operational amplifier P102, N pole is connected with the positive pole of electric capacity C104, one end of resistance R101 is connected with the positive pole of electric capacity C103, the other end is connected with the positive pole of electric capacity C101, the negative pole of electric capacity C105 is connected with the positive pole of electric capacity C104, positive pole is connected with the collector electrode of triode VT104, one end of resistance R110 is connected with the positive pole of electric capacity C105, the other end is connected with the positive pole of electric capacity C101 after relay K 102, the N pole of diode D103 is connected with the positive pole of electric capacity C101, P pole is connected with the base stage of triode VT104 after resistance R111, the P pole of diode D105 is connected with the positive pole of electric capacity C101 after resistance R112, N pole is connected with the Discharge pin of time-base integrated circuit Q102, the P pole of diode D104 is connected with the N pole of diode D105, N pole is connected with the emitter of triode VT104, one end of slide rheostat RP102 is connected with the P pole of diode D105, the other end is connected with the N pole of diode D104, sliding end is connected with the Control voltage pin of time-base integrated circuit Q102, the N pole of diode D106 is connected with the P pole of diode D105, P pole ground connection, the minus earth of electric capacity C106, positive pole is connected with Thresshold pin with the Trigger pin of time-base integrated circuit Q102, thermistor RT101 is in parallel with electric capacity C106, one end of slide rheostat RP103 is connected with the N pole of diode D106, the other end is connected with the positive pole of electric capacity C106 after resistance R113, wherein, the secondary two ends of transformer T101 are connected with two inputs of diode ballast U101 respectively, the two ends on its former limit are connected on two incoming lines, the negative output terminal ground connection of diode rectifier U101, the GND pin ground connection of integrated regulator Q101, IN pin is connected with the positive pole of electric capacity C101, the normally-closed contact switch S 101 of described relay K 101 is arranged on incoming line, the normally-closed contact switch S 102 of relay K 102 is arranged on incoming line, the emitter of triode VT101 is all connected with the base stage of triode VT103 with the emitter of triode VT102, the grounded emitter of triode VT103, the P pole of diode D103 is connected with the tie point of relay K 102 with resistance R110, and the P pole of diode D103 is also connected with the Discharge pin of time-base integrated circuit Q102, the grounded emitter of triode VT104, the GND pin ground connection of time-base integrated circuit Q102, its Vcc pin and Reset pin are all connected with the N pole of diode D106.When voltage overrate, relay K 101 obtains electric, normally-closed contact switch S 101 disconnects, circuit supply is disconnected, and when the operating temperature of circuit exceedes rated temperature, thermistor RT101 resistance becomes large, relay K 102 obtains electric, normally-closed contact switch S 102 disconnects, and circuit supply is disconnected.
The structure of described virtual protection amplifying circuit 20 as shown in Figure 2, it is primarily of power amplifier P3, power amplifier P4, NAND gate IC1, NAND gate IC2, negative pole is connected with the electrode input end of power amplifier P3, the polar capacitor C7 that positive pole is connected with the negative input of NAND gate IC2 after resistance R7, one end is connected with the negative input of NAND gate IC1, the resistance R4 that the other end is connected with the electrode input end of power amplifier P3, be serially connected in the resistance R5 between the negative input of power amplifier P3 and output, one end is connected with the output of NAND gate IC1, the resistance R6 that the other end is connected with the negative input of power amplifier P4, be serially connected in the polar capacitor C8 between the electrode input end of power amplifier P4 and output, positive pole is connected with the output of NAND gate IC2, negative pole is in turn through electric capacity C9 that voltage stabilizing didoe D4 is connected with the output of power amplifier P3 after resistance R8, P pole is connected with the output of power amplifier P4, N pole is in turn through diode D5 that resistance R10 is connected with the tie point of resistance R8 with voltage stabilizing didoe D4 after resistance R9, and N pole is connected with the negative pole of electric capacity C9, the voltage stabilizing didoe D6 that P pole is connected with the tie point of resistance R10 with diode D5 forms.
Meanwhile, the electrode input end of described NAND gate IC1 is connected with the negative input of power amplifier P3; The electrode input end of the output NAND gate IC2 of power amplifier P4 is connected, and its electrode input end is then connected with the output of power amplifier P3; Described resistance R9 is connected with the cathode output end of diode rectifier U with the tie point of resistance R10, and the positive pole of polar capacitor C7 is then connected with the negative input of power amplifier P1.
Described switched filter circuit is by triode Q, and electric capacity C1, electric capacity C2, resistance R1, resistance R2 and diode D1 form.Wherein, the base stage of triode Q forms loop with its collector electrode in turn after resistance R2, diode D1 and resistance R1.Electric capacity C1 and resistance R1 is in parallel, and electric capacity C2 and resistance R2 is in parallel, to form typical RC filter circuit.Meanwhile, the collector electrode of triode Q is connected with the cathode output end of diode rectifier U, its grounded emitter; The cathode output end of diode rectifier U is then directly connected with the negative input of power amplifier P1, and resistance R2 is then connected with the electrode input end of power amplifier P1 with the tie point of diode D1.Primary coil L1 and the diode D1 of described transformer T are in parallel.
In this switched filter circuit, resistance R1, electric capacity C1 and diode D1 form feedback-clamp circuit, can improve the peak-inverse voltage of conversion efficiency and reduction power amplifier P1 electrode input end.
Power output circuit is used for the direct voltage of stable output, and it is made up of diode D2, electric capacity C3, inductance L 4 and electric capacity C4.During connection, the P pole of diode D2 is connected with the Same Name of Ends of secondary coil L2, and its N pole is connected with the non-same polarity of secondary coil L2 after electric capacity C3.One end of described inductance L 4 is connected with the N pole of diode D2, the other end is connected with the non-same polarity of secondary coil L2 after electric capacity C4.The two ends of electric capacity C4 then as the output of whole power supply, for external loading provides required voltage and current.
Transformation feedback circuit is used for providing feedback operation voltage, to guarantee that ON-OFF control circuit can control sliding damper according to feedback voltage for ON-OFF control circuit.This transformation feedback circuit is then made up of diode D3 and electric capacity C5.During connection, the P pole of described diode D3 is connected with the non-same polarity of secondary coil L3, its N pole is connected with the Same Name of Ends of secondary coil L3 after electric capacity C5, meanwhile, and the Same Name of Ends ground connection of this secondary coil L3.
ON-OFF control circuit is switching control section of the present invention, and it is made up of field effect transistor MOS, power amplifier P2, voltage comparator U1, inductance L 5 and resistance R3.As shown in Figure 1, this inductance L 5 is serially connected between the output of power amplifier P1 and the N pole of diode D3, and the drain electrode of field effect transistor MOS is connected with the N pole of diode D3, its source electrode ground connection, its grid after resistance R3 are then connected with the output of power amplifier P2.
The S end of voltage comparator U1 is connected with the output of oscillator, and its R end is connected with the output of current comparator I1, and its Q end is then connected with the negative input of power amplifier P2.The electrode input end of power amplifier P2 is then connected with the drain electrode of field effect transistor MOS.The electrode input end of current comparator I2 is connected with the two ends of negative input with resistance R3, and during to guarantee field effect transistor MOS conducting, it can collect operating voltage from resistance R3 two ends.
Simultaneously, the output of this current comparator I2 is connected with the input of oscillator with the negative input of current comparator I1 respectively after slope equalizer W, to guarantee that slope equalizer W can provide auxiliary slope-compensation for current comparator I1, make its working stability.
The electrode input end of current comparator I1 is then connected with the non-same polarity of primary coil L1 with the output of power amplifier P1; An output of PWM controller is connected with the negative input of power amplifier P1 with the negative input of current comparator I1 respectively, its another output ground connection after electric capacity C6.
During use, the voltage acting on diode rectifier U carries out after filtering as the primary coil L1 of transformer T and power amplifier P1 provides operating voltage through switched filter circuit.When inductance coil L5 senses that external loading changes, when its induction reactance just changes, now power amplifier P2 impels field effect transistor MOS conducting under the acting in conjunction of voltage comparator U1 and inductance L 5, the pulse signal that PWM controller provides acts on power amplifier P1 and current comparator I1 after current comparator I1, sliding damper is obtained electric, and automatically regulate sliding tap according to the situation of change of load, thus change the primary coil L1 of transformer T and the turn ratio between secondary coil L2 and secondary coil L3, final realization is to the stable power-supplying function of load.
As mentioned above, just the present invention can well be realized.
Claims (5)
1. a multiple power levels amp pulse width modulation type hybrid protection type switching power supply, primarily of diode rectifier U, power amplifier P1, transformer T, be serially connected in the switched filter circuit between diode rectifier U and power amplifier P1, the power output circuit be connected with the secondary coil L2 of transformer T, the transformation feedback circuit be connected with the secondary coil L3 of transformer T, the ON-OFF control circuit be connected with transformation feedback circuit, the oscillator be connected with ON-OFF control circuit, the current comparator I1 be connected with ON-OFF control circuit, the current comparator I2 be connected with ON-OFF control circuit, respectively with oscillator (40), the slope equalizer W that current comparator I1 is connected with current comparator I2, the PWM controller (30) be connected with current comparator I1 with power amplifier P1 respectively, and output is connected with the tap on the primary coil L1 of transformer T, and the sliding damper that input is connected with the output of power amplifier P1 (50) forms, it is characterized in that, virtual protection amplifying circuit (20) is also serially connected with between the cathode output end and the negative input of power amplifier P1 of diode rectifier U, this virtual protection amplifying circuit (20) is primarily of power amplifier P3, power amplifier P4, NAND gate IC1, NAND gate IC2, negative pole is connected with the electrode input end of power amplifier P3, the polar capacitor C7 that positive pole is connected with the negative input of NAND gate IC2 after resistance R7, one end is connected with the negative input of NAND gate IC1, the resistance R4 that the other end is connected with the electrode input end of power amplifier P3, be serially connected in the resistance R5 between the negative input of power amplifier P3 and output, one end is connected with the output of NAND gate IC1, the resistance R6 that the other end is connected with the negative input of power amplifier P4, be serially connected in the polar capacitor C8 between the electrode input end of power amplifier P4 and output, positive pole is connected with the output of NAND gate IC2, negative pole is in turn through electric capacity C9 that voltage stabilizing didoe D4 is connected with the output of power amplifier P3 after resistance R8, P pole is connected with the output of power amplifier P4, N pole is in turn through diode D5 that resistance R10 is connected with the tie point of resistance R8 with voltage stabilizing didoe D4 after resistance R9, and N pole is connected with the negative pole of electric capacity C9, the voltage stabilizing didoe D6 that P pole is connected with the tie point of resistance R10 with diode D5 forms, the electrode input end of described NAND gate IC1 is connected with the negative input of power amplifier P3, the electrode input end of the output NAND gate IC2 of power amplifier P4 is connected, and its electrode input end is then connected with the output of power amplifier P3, described resistance R9 is connected with the cathode output end of diode rectifier U with the tie point of resistance R10, and the positive pole of polar capacitor C7 is then connected with the negative input of power amplifier P1, diode rectifier U is also provided with mixed type protective circuit (10), described mixed type protective circuit (10) is by incoming line, transformer T101, diode rectifier U101, integrated regulator Q101, time-base integrated circuit Q102, triode VT101, triode VT102, triode VT103, triode VT104, operational amplifier P101, operational amplifier P102, minus earth, the electric capacity C101 that positive pole is connected with the positive output end of diode rectifier U101, minus earth, the electric capacity C102 that positive pole is connected with the OUT pin of integrated regulator Q101, one end is connected with the positive pole of electric capacity C102, the resistance R101 that the other end is connected with the negative input end of operational amplifier P101, N pole is connected with the positive pole of electric capacity C102, the diode D101 that P pole is connected with the collector electrode of triode VT101, the relay K 101 in parallel with diode D101, one end is connected with the collector electrode of triode VT101, the resistance R103 of other end ground connection after resistance R102, one end is connected with the base stage of triode VT101, the resistance R104 that the other end is connected with the output of operational amplifier P101, one end is connected with the N pole of diode D101, the resistance R105 that the other end is connected with the collector electrode of triode VT103, one end ground connection, the slide rheostat TP101 that the other end is connected with the positive input terminal of operational amplifier P101, minus earth, the electric capacity C103 that positive pole is connected with the positive input terminal of operational amplifier P101, minus earth, the electric capacity C104 that positive pole is connected with the OUT pin of integrated regulator Q101 after resistance R109, one end is connected with the OUT pin of integrated regulator Q101, the resistance R108 that the other end is connected with the collector electrode of triode VT102 with the negative input end of operational amplifier P102 simultaneously, one end ground connection, the resistance R107 that the other end is connected with the negative input end of operational amplifier P102, one end is connected with the base stage of triode VT102, the resistance R106 that the other end is connected with the output of operational amplifier P102, P pole is connected with the positive input terminal of operational amplifier P102, the voltage stabilizing didoe D102 that N pole is connected with the positive pole of electric capacity C104, one end is connected with the positive pole of electric capacity C103, the resistance R101 that the other end is connected with the positive pole of electric capacity C101, negative pole is connected with the positive pole of electric capacity C104, the electric capacity C105 that positive pole is connected with the collector electrode of triode VT104, one end is connected with the positive pole of electric capacity C105, the resistance R110 that the other end is connected with the positive pole of electric capacity C101 after relay K 102, N pole is connected with the positive pole of electric capacity C101, the diode D103 that P pole is connected with the base stage of triode VT104 after resistance R111, P pole is connected with the positive pole of electric capacity C101 after resistance R112, the diode D105 that N pole is connected with the Discharge pin of time-base integrated circuit Q102, P pole is connected with the N pole of diode D105, the diode D104 that N pole is connected with the emitter of triode VT104, one end is connected with the P pole of diode D105, the other end is connected with the N pole of diode D104, the slide rheostat RP102 that sliding end is connected with the Control voltage pin of time-base integrated circuit Q102, N pole is connected with the P pole of diode D105, the diode D106 of P pole ground connection, minus earth, the electric capacity C106 that positive pole is connected with Thresshold pin with the Trigger pin of time-base integrated circuit Q102, the thermistor RT101 in parallel with electric capacity C106, and one end is connected with the N pole of diode D106, the slide rheostat RP103 that the other end is connected with the positive pole of electric capacity C106 after resistance R113 forms, wherein, the secondary two ends of transformer T101 are connected with two inputs of diode ballast U101 respectively, the two ends on its former limit are connected on two incoming lines, the negative output terminal ground connection of diode rectifier U101, the GND pin ground connection of integrated regulator Q101, IN pin is connected with the positive pole of electric capacity C101, the normally-closed contact switch S 101 of described relay K 101 is arranged on incoming line, the normally-closed contact switch S 102 of relay K 102 is arranged on incoming line, the emitter of triode VT101 is all connected with the base stage of triode VT103 with the emitter of triode VT102, the grounded emitter of triode VT103, the P pole of diode D103 is connected with the tie point of relay K 102 with resistance R110, and the P pole of diode D103 is also connected with the Discharge pin of time-base integrated circuit Q102, the grounded emitter of triode VT104, the GND pin ground connection of time-base integrated circuit Q102, its Vcc pin and Reset pin are all connected with the N pole of diode D106.
2. a kind of multiple power levels amp pulse width modulation type hybrid protection type switching power supply according to claim 1, it is characterized in that, described switched filter circuit is by triode Q, and electric capacity C1, electric capacity C2, resistance R1, resistance R2 and diode D1 form; The base stage of described triode Q forms loop with its collector electrode in turn after resistance R2, diode D1 and resistance R1, and electric capacity C1 and resistance R1 is in parallel, and electric capacity C2 and resistance R2 is in parallel; The collector electrode of triode Q is connected with the cathode output end of diode rectifier U, its grounded emitter; The cathode output end of diode rectifier U is then directly connected with the negative input of power amplifier P1, and resistance R2 is then connected with the electrode input end of power amplifier P1 with the tie point of diode D1; The primary coil L1 of transformer T is then in parallel with diode D1.
3. a kind of multiple power levels amp pulse width modulation type hybrid protection type switching power supply according to claim 2; it is characterized in that; the diode D2 that described power output circuit is connected with the Same Name of Ends of secondary coil L2 by P pole, N pole is connected with the non-same polarity of secondary coil L2 after electric capacity C3, and the inductance L 4 that one end is connected with the N pole of diode D2, the other end is connected with the non-same polarity of secondary coil L2 after electric capacity C4 forms.
4. a kind of multiple power levels amp pulse width modulation type hybrid protection type switching power supply according to claim 3, it is characterized in that, described transformation feedback circuit is made up of diode D3 and electric capacity C5; The P pole of described diode D3 is connected with the non-same polarity of secondary coil L3, its N pole is connected with the Same Name of Ends of secondary coil L3 after electric capacity C5, the Same Name of Ends ground connection of described secondary coil L3.
5. a kind of multiple power levels amp pulse width modulation type hybrid protection type switching power supply according to claim 4, it is characterized in that, described ON-OFF control circuit is made up of field effect transistor MOS, power amplifier P2, voltage comparator U1, inductance L 5 and resistance R3; Described inductance L 5 is serially connected between the output of power amplifier P1 and the N pole of diode D3, and the drain electrode of field effect transistor MOS is connected with the N pole of diode D3, its source electrode ground connection, its grid after resistance R3 are then connected with the output of power amplifier P2; The S end of voltage comparator U1 is connected with the output of oscillator (40), and its R end is connected with the output of current comparator I1, and its Q end is then connected with the negative input of power amplifier P2; The electrode input end of power amplifier P2 is then connected with the drain electrode of field effect transistor MOS; The electrode input end of current comparator I2 is then connected with the two ends of resistance R3 with negative input, and its output is connected with the input of oscillator (40) with the negative input of current comparator I1 respectively after slope equalizer W; The electrode input end of current comparator I1 is then connected with the output of power amplifier P1; An output of PWM controller (30) is connected with the negative input of power amplifier P1 with the negative input of current comparator I1 respectively, its another output ground connection after electric capacity C6.
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| CN201410707533.3A CN104467485A (en) | 2014-11-27 | 2014-11-27 | Multi-stage power amplification pulse width-modulation type switch voltage stabilizing power source |
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| CN201510310454.3A CN104993705A (en) | 2014-11-27 | 2015-06-09 | Multistage power amplification and pulse width modulation type mixed protection stabilized switching power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107990913A (en) * | 2017-12-21 | 2018-05-04 | 中国船舶重工集团公司第七0七研究所 | A kind of programmable DC regulated power supply for optical fibre gyro test |
| CN111524706A (en) * | 2020-04-27 | 2020-08-11 | 宁波奥克斯电气股份有限公司 | Electrolytic capacitor protection device and method and air conditioner |
| CN113252126A (en) * | 2021-05-21 | 2021-08-13 | 中国水利水电科学研究院 | Terminal system capable of identifying personal water consumption |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108336923B (en) * | 2018-04-13 | 2023-10-20 | 武汉华中华昌能源电气科技有限公司 | Pulse circuit and rectangular wave pulse source with same |
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2014
- 2014-11-27 CN CN201410707533.3A patent/CN104467485A/en active Pending
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107990913A (en) * | 2017-12-21 | 2018-05-04 | 中国船舶重工集团公司第七0七研究所 | A kind of programmable DC regulated power supply for optical fibre gyro test |
| CN111524706A (en) * | 2020-04-27 | 2020-08-11 | 宁波奥克斯电气股份有限公司 | Electrolytic capacitor protection device and method and air conditioner |
| CN111524706B (en) * | 2020-04-27 | 2022-03-04 | 宁波奥克斯电气股份有限公司 | Electrolytic capacitor protection device and method and air conditioner |
| CN113252126A (en) * | 2021-05-21 | 2021-08-13 | 中国水利水电科学研究院 | Terminal system capable of identifying personal water consumption |
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Application publication date: 20151021 |